/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.library.anomaly;

import org.apache.iotdb.commons.udf.utils.UDFDataTypeTransformer;
import org.apache.iotdb.library.util.Util;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.udf.api.UDTF;
import org.apache.iotdb.udf.api.access.Row;
import org.apache.iotdb.udf.api.collector.PointCollector;
import org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations;
import org.apache.iotdb.udf.api.customizer.parameter.UDFParameterValidator;
import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters;
import org.apache.iotdb.udf.api.customizer.strategy.RowByRowAccessStrategy;
import org.apache.iotdb.udf.api.type.Type;

/**
 * This function is used to detect range anomaly of time series.
 */
public class UDTFRange implements UDTF {
    private TSDataType dataType;
    private double upperBound;
    private double lowerBound;

    @Override
    public void validate(UDFParameterValidator validator) throws Exception {
        validator
                .validateInputSeriesNumber(1)
                .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE);
    }

    @Override
    public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations)
            throws Exception {
        configurations
                .setAccessStrategy(new RowByRowAccessStrategy())
                .setOutputDataType(parameters.getDataType(0));
        this.lowerBound = parameters.getDouble("lower_bound");
        this.upperBound = parameters.getDouble("upper_bound");
        this.dataType = UDFDataTypeTransformer.transformToTsDataType(parameters.getDataType(0));
    }

    @Override
    public void transform(Row row, PointCollector collector) throws Exception {
        int intValue;
        long longValue;
        float floatValue;
        double doubleValue;
        long timestamp;
        timestamp = row.getTime();
        switch (dataType) {
            case INT32:
                intValue = row.getInt(0);
                if (intValue > upperBound || intValue < lowerBound) {
                    Util.putValue(collector, dataType, timestamp, intValue);
                }
                break;
            case INT64:
                longValue = row.getLong(0);
                if (longValue > upperBound || longValue < lowerBound) {
                    Util.putValue(collector, dataType, timestamp, longValue);
                }
                break;
            case FLOAT:
                floatValue = row.getFloat(0);
                if (floatValue > upperBound || floatValue < lowerBound) {
                    Util.putValue(collector, dataType, timestamp, floatValue);
                }
                break;
            case DOUBLE:
                doubleValue = row.getDouble(0);
                if (doubleValue > upperBound || doubleValue < lowerBound) {
                    Util.putValue(collector, dataType, timestamp, doubleValue);
                }
                break;
            default:
                throw new Exception("No such kind of data type.");
        }
    }

    @Override
    public void terminate(PointCollector collector) throws Exception {
    }
}
